Means for dehydration of substances suspended in water



R. SALWEN El AL 1,768,215 MEANS FOR DEHYDRATION OF SUBSTANCES SUSPENDED IN WATER Jane 24, 1930.

Filed Jan. 26, 1928 1?. sa/wem an J- J. @Inrn tangular shape.

Patented June 24, 1930 outrun? sures meme sALWEN AND JOHAN GER-n, or eneneusennd swnnnn, nssienons ro MORGARDSHAMMARS MEKAnrsKA vnnrzs'rans anrrnsotae, or MOBGARCDSHAM- ruin, SWEDEN, n JOINT-STOCK comrnnr l 7 Means roe DEHYDRATION or suesrancns susrnnnnao IN warns Application filed January 26, 1928, Serial No. 249,754, and in Swedennugust 18, 1826.

For the purpose of separating material suspended in water from such Water (dehydration of thematerial), means provided with jolting troughs are advantageously used, in which the suspended material is fed in at the one end of a jolting trough and discharged at the other end, after'the material has been separated from the water. The trough is jolted in the direction between the two end portions in question, which form the two short sides of the trough,'the latter having preferably a rec- T he bottom of the trough is inclined'from the feeding end toward 'a point at a certain distance from the discharge end, from which point the bottom again slopes upwards toward the last-mentioned end. The portion ofthe material which is heavier than water is deposited upon the part of the bottom inclined downwards and forwards from the feeding end, and is carried forwards through the jolting movement, until itis brought onto the oppositely sloping fore end, where the material is being packed together. When the material has been packed sufiiciently solid and to a sufiicient height, the material is moved, by reason of the jolting action, continuously upwards along the oppositely sloping part and is finally discharged at the fore edge of the same.

In the arrangements of this kind as hitherto known, the separated water has been caused to move in a direction opposite to that of the material, and the water has left the trough at the rear end thereof, during the supply of the material. According to the present invention, the means are, instead, devised in such a manner that the water is caused to move over the trough in a direction forming an angle less than 180 with the direction in which the material is moved by reason of the jolting of the trough. The Water is then discharged at the side of the trough running longitudinally of the jolting means. This arrangement considerably facilitates the discharge and increases the working capacity of the device in a corresponding degree. The lateral discharge of the water is brought about in the most suitable manner by arranging the bot tom of the trough sloping toward the one side. 7

An important means for the rapid and complete separation of the water also consists in the provisionof aconduit for compressed air'arranged to open at that end of the trough, or in the proximity thereof,

where the dehydrated material is discharged, n such a manner that the air can be pressed out in a direction opposite to that ofthe water entrained with the material at the surface thereof, whereby said Water is driven back, so as not to be: entrained with the material discharged.

An embodiment of the invention is illustrated in the accompanying drawing. 5

1 is a side view of the trough shown in longitudinal section. Fig. 2 is a plan view of the trough, and Fig. 3 a cross-section of thesame, The trough is of a rectangular shape having a beveled portion at the-one side of the fore end, and forms two compartments,

the bottom of the first compartment 1 is in clined from the rear end, the feeding-in end, in a forward and downward direction toward the compartment 2, the bottom ofwhich latter is sloping toward the fore end (discharge end). provided with longitudinal beams 6 paralleling one another, said beams being adapted mutually with respect to their levels in such a manner that all of the upperedges of the beams are situated in the same horizontal plane. The trough is limited on three sides by walls 3, whereasv an opening or slot extending between the points tand 5 (Fig. 2) is provided on the fourth side, the lower edge of said opening or slot coinciding with the above-mentioned horizontal plane between the upper edges of the beams 6. As will appear from Fig. -3, the trough is inclined toward the opening 4:, 5. The suspended material is supplied through a shaft or duct at the supply end or the side of the trough opposite to that of the openingfd, 5. Provided within the range of the discharge end is a conduit 7 for compressed air extending transversely over the trough The con-v The compartment 1 is duit is provided with a series of openings of the material packed together in the compartment 2 and discharged from the latter.

The material 1 is spread out from that corner of the trough, whereit is supplied through the shaft or duct9, and the parts of the material whichare not entrained with the water will sink down, as stated above, in the compartment 1, andare moved forwards in said compartment by reason of the jolting action. water lS lIlOVECl, together with particles of the material entrained therewith, by reason of the sloping position of the trough, mainly in an oblique direction of the board, from the feeding-in point, that is to say, in a direction forming an angle less than 180 with the direction in which the material. 7 ,moves on account of the oltlng action. The water'1s discharged over the lower edge 'of the opening 4-, 5. The water layer which, as stated above, is entrained on the surface of the material conveyed in the compartment 2,

is hit by the air j et 8 so as to bedriven back,

' and is then caused to flow'oif throughthe opening l, 5.' In this manner, the separ tion'of the water iseffected rapidly, and the material discharged at the discharge end is dehydrated as completely as possible.

YVhatwe claim is 1. A device of the character described including a longitudinally movable tablehaving its upper surface inclined to one side, longitudinally arranged spaced rifl'ies on said upper surface, said rifl'iles' successively increasing in height toward the lower lateral edge of the table to permit the water to flow off atsaid side but longitudinally retain the solids by the rilfles.

2. A device of the character described including a longitudinally movable table hav- 7 ing its upper surface inclined to one side,

longitudinally arranged and laterally spaced .rifiles on saidupper surface, said riffles successively increasing in height toward the lower lateral'edge of the table to permit the water to flow off at said side but retain the solids by the riffles, said table having a beveled forward end. v

3. A device of the character described including a longitudinally movable table having its upper surface inclinedto one side, arranged and laterally spaced ritlles on said upper surface, said riflles successively increasing in height toward the lower lateraledge of the table to permit the' water to flow off at said side but retain the solidsby the rifiles, said table having a beveled portion at one side of its forward end, and "a vtransverse air sup'ply'con- At the same time the and laterally portion at one side of its and to one side, longitudinally arranged and laterally spaced ritlles on said upper surface, said ritfles success velyincreasing in height toward the lower lateral edgeof the table to permit thewater to flow off at said side but retain the solids by the rifiles.

5. A device of the character described including a longitudinally movable table hav ing its upper surface inclined forwardly and to one side, longitudinally arranged and laterally spaced rilfles onsaidupper surface, said riflles successivelyincreaslng n height toward the lower lateral edge-ofcthe table to permit vthe water to flow off at said side but retain the solids by the ritlies, said.

of its forward end.

61A device of the character described including alongitudinally movable table havtable having a beveledportion at one side ing its upper surface inclined forwardly andto one side, longitudinally; "arranged and laterally spaced rifli'es on said upper surface, said riflles successively increasing in height towardthe'low er lateral edge of the table to permit the water to flow off at said side but retain the solids by the ritlles, and

a transverse air supply conduit thereacross having obliquely downwardly directed apertures.

.In testimony whereof we'atfix our signa RAGNAR sALwEN I tures.

'JOHAN ones. 

